Open and Save a Presentation in AWS S3 Cloud Storage

3 Aug 202617 minutes to read

Prerequisites

AWS S3 Cloud Storage is required.
An active AWS account with permission to read from and write to an S3 bucket. If you do not have one, see Create an AWS account.
An IAM user with AmazonS3FullAccess (or equivalent scoped) permissions and the access key ID and secret access key. For setup steps, see Create an IAM user and Manage access keys for an IAM user.
.NET 8.0 or later.
A target S3 bucket to read from or write to. See Create your first S3 bucket.

Open a Presentation from AWS S3

Steps to open a Presentation from AWS S3 Cloud Storage.

Step 1: Create an ASP.NET Core Web Application (Model-View-Controller).

Create an ASP.NET Core Web App project in Visual Studio

Step 2: Name the project.

Name the project

Step 3: Install the following NuGet packages in your application from NuGet.org.

Install Syncfusion.Presentation.Net.Core NuGet Package
Install AWSSDK.S3 NuGet Package

Step 4: Add a new button to Index.cshtml as shown below.

CSHTML
@{Html.BeginForm("EditDocument", "Home", FormMethod.Get);
    {
        <div>
            <input type="submit" value="Edit Document" style="width:150px;height:27px" />
        </div>
    }
    Html.EndForm();
}

Step 5: Include the following namespaces in HomeController.cs.

C#
using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using Syncfusion.Presentation;

Step 6: Add the following code snippet in HomeController.cs to open a Presentation from AWS S3 Cloud Storage.

C#
public async Task<IActionResult> EditDocument()
{
    try
    {
        //Retrieve the document from AWS S3
        MemoryStream stream = await GetDocumentFromS3();

        //Set the position to the beginning of the MemoryStream
        stream.Position = 0;

        //Create an instance of PowerPoint Presentation file
        using (IPresentation pptxDocument = Presentation.Open(stream))
        {
            //Get the first slide from the PowerPoint presentation
            ISlide slide = pptxDocument.Slides[0];

            //Get the first shape of the slide
            IShape shape = slide.Shapes[0] as IShape;

            //Change the text of the shape
            if (shape.TextBody.Text == "Company History")
                shape.TextBody.Text = "Company Profile";

            //Saving the PowerPoint file to a MemoryStream 
            MemoryStream outputStream = new MemoryStream();
            pptxDocument.Save(outputStream);

            //Download the PowerPoint file in the browser
            FileStreamResult fileStreamResult = new FileStreamResult(outputStream, "application/powerpoint");
            fileStreamResult.FileDownloadName = "EditPowerPoint.pptx";
            return fileStreamResult;
        }
    }
    catch (AmazonS3Exception ex)
    {
        //Amazon S3-specific error (e.g., AccessDenied, NoSuchKey)
        Console.WriteLine($"S3 error: {ex.ErrorCode} - {ex.Message}");
        return Content("Error occurred while retrieving the file from S3.");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error: {ex.Message}");
        return Content("Error occurred while processing the file.");
    }
}

Download a File from AWS S3 Cloud Storage

The following helper method downloads a Presentation from AWS S3 Cloud Storage and returns it as a MemoryStream positioned at the beginning.

C#
/// <summary>
/// Downloads the PowerPoint file from the configured AWS S3 bucket.
/// </summary>
/// <returns>A <see cref="MemoryStream"/> containing the PowerPoint file, positioned at the beginning.</returns>
public async Task<MemoryStream> GetDocumentFromS3()
{
    //Your AWS Storage Account bucket name 
    string bucketName = "your-bucket-name";

    //Name of the PowerPoint file you want to load from AWS S3
    string key = "PowerPointTemplate.pptx";

    //Configure AWS credentials and region
    var region = Amazon.RegionEndpoint.USEast1;
    var credentials = new Amazon.Runtime.BasicAWSCredentials("your-access-key", "your-secret-key");
    var config = new AmazonS3Config
    {
        RegionEndpoint = region
    };

    try
    {
        using (var client = new AmazonS3Client(credentials, config))
        {
            //Create a MemoryStream to copy the file content
            MemoryStream stream = new MemoryStream();

            //Download the file from S3 into the MemoryStream
            var response = await client.GetObjectAsync(new GetObjectRequest
            {
                BucketName = bucketName,
                Key = key
            });

            //Copy the response stream to the MemoryStream
            await response.ResponseStream.CopyToAsync(stream);

            //Reset the position so the caller can read the stream from the beginning
            stream.Position = 0;

            return stream;
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error retrieving document from S3: {ex.Message}");
        throw;
    }
}

You can download a complete working sample from GitHub.

By executing the program, you will get the Presentation as follows.

Output Presentation after opening and editing the file from AWS S3

Save a Presentation to AWS S3

Steps to save a Presentation to AWS S3 Cloud Storage.